# devCalc — Developers Calculator Free

> Hybrid scientific, engineering, and programmer calculator with number base conversion and engineering mode. (iPhone/iPad app by Tamas Rudnai.)

- Source: https://appshunter.io/ios/app/devcalc/id596652953 (this page in markdown: same URL + `.md`)
- Developer: [Tamas Rudnai](https://appshunter.io/developer/596652956)
- Category: Utilities, Productivity
- Price: Free
- Rating: 4.70/5 from 15 App Store ratings · 20 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.0 · 2 MB
- Languages: American English
- Released: 2013-01-31
- Data updated: 2026-06-10
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/devcalc/id596652953/reviews.md

## What is devCalc?

devCalc is an optimum blend of an engineering, a scientific and a programmers calculator.

Special features:

• Easy number base conversion from Binary, Octal, Decimal and Hexadecimal (bin, oct, dec, hex)
• Real Engineering mode allows you to display big and small numbers in human readable format
• Extensive functions for Scientists and Software Developers - Rotate device to landscape mode
• Swipe LCD display sideways to change color theme

devCalc is designed from top to bottom developers and engineers in mind. As a hybrid scientific and programmer calculator it gives smooth blend for IT professionals, engineers and scientists as well as university students. 

Real Engineering Mode is an innovative input and display method, that makes engineers life easier by automatically scaling the number to a human readable format. This allows you to concentrate on the calculation rather than how to translate that to a calculator friendly format.

To enter a number in Real Engineering Format even in decimal mode: Just tap on the Kilo, Mega, Giga, Milli, Micro or Nano buttons. The calculator then automatically scales the calculated numbers and displays it in the way you got used to.

For example 500k * 3 automatically displayed as 1.5M. In the meanwhile devCalc Pro keeps the high precision value, therefore later on you can switch the view back to Kilo to see 1'500k, or turning the Real Engineering Mode completely off by tapping on the "k" button again to see all the decimal digits (1'500'000). Try this new and unique feature out and tell us your story how you use Real Engineering Mode.

One of the great examples is to calculate Ohm’s law in electronics: You are looking for a resistor value for 5V and 3mA, so you type: 5 / 3m and you will see 1.67k on the screen (1.67 kilo-Ohm).

## Key features

- Number base conversion (Binary, Octal, Decimal, Hexadecimal)
- Real Engineering Mode for human-readable scaling
- Extensive scientific and developer functions
- Landscape mode for extended functions
- Swipeable LCD for color theme changes

## Recent user reviews (10 of 20)

All indexed reviews: https://appshunter.io/ios/app/devcalc/id596652953/reviews.md

### 4/5 — Great!

*2020-06-19, version 1.7*

At just 1.4MB, this app is punching well above its weight. Congratulations!
And its high contrast makes it easy to use in bright light. But that brings me to a minor criticism: the colours are a bit intense - especially the blue. I realise that subduing the colour scheme will probably increase file size but I think making it easier on the eye would improve the user experience.

### 5/5 — Great app

*2018-03-12*

This is a great calculator app especially for programmers. The hex functions are perfect. I couldn’t find the parentheses at fist but they are there when you press the “2nd” key. I like it so much I am purchasing the pro version.

### 5/5 — Great tool for software developers

*2017-04-30*

Elegant look, and it does everything you could want, working great.

### 5/5 — Dev calc

*2017-04-14*

Works great..

### 5/5 — Excellent

*2017-01-22*

This calculator has it all and more, excellent tool!!!👌

### 4/5 — Very Nice Calc

*2016-10-11*

Has everything I need.  One star off for obnoxious nag screen.

### 4/5 — Very good

*2016-01-03*

One of the best calc I had use

### 4/5 — Nice app easy radix conversion

*2015-08-07*

Nice app easy radix conversion

### 5/5 — Easy to read and use

*2015-04-08*

Very useful calculator.  Easy to read and stands out on iPhone6+ display.

### 4/5 — Very nice

*2015-03-31*

Very perfect

## Frequently asked questions about devCalc

### What is devCalc?

devCalc is a free utility app that functions as a hybrid engineering, scientific, and programmer calculator. It offers features like number base conversion and a unique 'Real Engineering Mode' for easier number scaling.

### What number bases can devCalc convert between?

devCalc supports easy number base conversion between Binary, Octal, Decimal, and Hexadecimal (bin, oct, dec, hex).

### How does devCalc's Real Engineering Mode work?

Real Engineering Mode allows devCalc to automatically scale numbers into human-readable formats using prefixes like Kilo, Mega, Giga, Milli, Micro, or Nano. For example, 500k * 3 is displayed as 1.5M.

### Is devCalc suitable for electronics calculations?

Yes, devCalc is well-suited for electronics calculations. For instance, calculating Ohm's law with 5V and 3mA results in 1.67k on the screen, representing 1.67 kilo-Ohms.

### Can I change the appearance of devCalc?

Yes, you can swipe the LCD display sideways to change the color theme of devCalc, allowing for a personalized user experience.

### What devices does devCalc support?

devCalc is available for iPhone and iPod devices, as indicated by its supported devices list.

### How often is devCalc updated?

The latest version of devCalc is 1.7, and it was last updated on September 22, 2017. This indicates a less frequent update cycle.

### Does devCalc have ads?

No, devCalc does not contain advertisements. The app is free to download and use without any ad interruptions.

## Version history (last 5 releases)

### 1.7 — 2017-09-22

This app has been updated by Apple to display the Apple Watch app icon.

Thank you for using devCalc!
We are providing iOS 11 support and various bug fixes and performance improvements with this release, please make sure to update it
We have unlocked all arithmetical, binary and logic functions, please enjoy :-)
We have also changed the LCD screen design for the free version to a more professional looking one, hope you like it!

### 1.6 — 2014-02-11

This is a BugFix release with some user experience improvements. 

Please do not forget to give us feedback and bug reports, so we can keep this calculator at the best shape for you. You can contact us on the Facebook page and give us feedback through Customer Review section on App Store. See details on the help screen within devCalc.

Detailed Information:

- BugFix: Number negation now works on the results too, not only onthe last input
- BugFix: Tailing zero bug when pressing EE button
- BugFix: "DECIMAL PLACES:" text was not removed when a non-digit pressed
- BugFix: Minor bug in number conversion in Real Engineering mode
- BugFix: Help Screen rotation fixed

### 1.5 — 2013-09-11

Bugfixes and improvements

### 1.4 — 2013-08-14

This is a maintenance version. 

- The initial banner is displayed only at the first run
- Some of the functions that was only available on the Pro version is now enabled on the free version as well
- Triangular number is now calculated for any floating point numbers using a high precision equation
- Bugfixes including fixing the square root issue on non-integer numbers

Please do not forget to rate it, your feedback is valuable to us. Thank you!

### 1.3 — 2013-04-29

-	Tips in Help Screen
-	Improved Screen Rotation Speed
-	Better User Interaction
-	BugFix: Screen Orientation Issues on iPad
-	BugFix: Precision of Constant PI
-	Other BugFixes and Improvements

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## More apps by Tamas Rudnai

- [devCalc Pro](https://appshunter.io/ios/app/devcalc-pro/id606025918)
- [Open Air Rádió](https://appshunter.io/ios/app/open-air-radio/id1482166322)
- [NetGO CPA](https://appshunter.io/ios/app/netgo-cpa/id6470384339)

All apps by Tamas Rudnai: https://appshunter.io/developer/596652956

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*